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• Pipe data from InputStream to OutputStream in Java

  - by Wangnick

  Dear all, I'd like to send a file contained in a ZIP archive unzipped to an external program for further decoding and to read the result back into Java. ZipInputStream zis = new ZipInputStream(new FileInputStream(ZIPPATH)); Process decoder = new ProcessBuilder(DECODER).start(); ??? BufferedReader br = new BufferedReader(new InputStreamReader( decoder.getInputStream(),"us-ascii")); for (String line = br.readLine(); line!=null; line = br.readLine()) { ... } What do I need to put into ??? to pipe the zis content to the decoder.getOutputStream()? I guess a dedicated thread is needed, as the decoder process might block when its output is not consumed.

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• Best Java 'framework' for LOW-END 3D Graphics?

  - by CodeJustin.com

  I've made my share of 2D games on various platforms but I have never developed a 3D game. I want to make a small "mmorpg". I already made my server in python and it works just fine with my flash 2D game but I decided I want to step it up and try out 3D. I want to make a 3D game for the web browser and I think Java might be a good choice for this. So basically I'm just looking for a straight forward and well documents 'framework' to make LOW-END 3D games. Keep in mind that I will be targeting peoples with very low-end PC's (plus my 3d modeling skills aren't great so I wouldn't mind hiding it somewhat, haha)

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• Java printf using variable field size?

  - by paxdiablo

  I'm just trying to convert some C code over to Java and I'm having a little trouble with String.printf. In C, to get a specific width based on a variable, I can use: printf("Current index = %*d\n", sz, index); and it will format the integer to be a specific size based on sz. Trying: System.out.println(String.format("Current index = %*d\n", sz, index)); results in an error since it doesn't like the *. I currently have the following kludge: System.out.println(String.format("Current index = %" + sz + "d\n", index)); but I'm hoping there's a slightly better way, yes?

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• Implementing toString on Java enums

  - by devoured elysium

  Hello It seems to be possible in Java to write something like this: private enum TrafficLight { RED, GREEN; public String toString() { return //what should I return here if I want to return //"abc" when red and "def" when green? } } Now, I'd like to know if it possible to returnin the toString method "abc" when the enum's value is red and "def" when it's green. Also, is it possible to do like in C#, where you can do this?: private enum TrafficLight { RED = 0, GREEN = 15 ... } I've tried this but it but I'm getting compiler errors with it. Thanks

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• Is there a Java equivalent to libevent?

  - by JoelPM

  I've written a high-throughput server that handles each request in its own thread. For requests coming in it is occasionally necessary to do RPCs to one or more back-ends. These back-end RPCs are handled by a separate queue and thread-pool, which provides some bounding on the number of threads created and the maximum number of connections to the back-end (it does some caching to reuse clients and save the overhead of constantly creating connections). Having done all this, though, I'm beginning to think an event-based architecture would be more efficient. In searching around I haven't found any equivalents to libevent for Java, but maybe I'm not looking in the right place? Mina-statemachine from Apache was the closest thing I found, but it looks more verbose than I need and there's no real release available. Any suggestions?

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• Java WebApp: Loading resource from .jar located in WEB-INF

  - by shaman.sir

  There are a lot of similar questions, but, probably, mine is a little bit different: What is the right way to load resource from inside of .jar file located in WEB-INF/lib folder (if I know the jar file name and the name of the class it resource belongs to), while Web Application is running? Should I use getServletContext().getResourceAsStream(?) for this purpose or the <name-of-known-class>.getResourseAsStream(?), and what path do I need to specify there? So, the structure is: /WEB-INF /classes /some/package/name ?.class #some Java code or Servlet that tries to read 'required-file.xml' /lib /<jar-with-known-name>.jar /another/package/with/known/name SomeKnownClass.class required-file.xml

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• [Java] Flood fill using a stack

  - by dafero

  Hello to everyone :), I am using the recursive Flood fill algorithm in Java to fill some areas of a image. With very small images it works fine, but when de image becomes larger the JVM gives me a Stack Over Flow Error. That's the reason why I have to reimplement the method using a Flood Fill with my own stack. (I read that's the best way to do it in these kind of cases) Can anyone explain me how to code it? (if you don't have the code at hand, with the pseudo-code of the algorithm will be fine) I've read a lot in the Internet but I haven't understood it very well. Thanks!

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• Java playback of 24 bit audio is incorrect

  - by Paul Hampson

  I am using the javax sound API to implement a simple console playback program based on http://www.jsresources.org/examples/AudioPlayer.html. Having tested it using a 24 bit ramp file (each sample is the last sample plus 1 over the full 24 bit range) it is evident that something odd is happening during playback. The recorded output is not the contents of the file (I have a digital loopback to verify this). It seems to be misinterpreting the samples in some way that causes the left channel to look like it is having some gain applied to it and the right channel looks like it is being attenuated. I have looked into whether the PAN and BALANCE controls need setting but these aren't available and I have checked the windows xp sound system settings. Any other form of playback of this ramp file is fine. If I do the same test with a 16bit file it performs correctly with no corruption of the stream. So does anyone have any idea why the Java Sound API is modifying my audio stream?

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• Determine file creation date in Java

  - by Todd

  Hello, There is another similar question to mine on StackOverflow (How to get creation date of a file in Java), but the answer isn't really there as the OP had a different need that could be solved via other mechanisms. I am trying to create a list of the files in a directory that can be sorted by age, hence the need for the file creation date. I haven't located any good way to do this after much trawling of the web. Is there a mechanism for getting file creation dates? Thanks, Todd BTW, currently on a Windows system, may need this to work on a Linux system as well. Also, I can't guarantee that a file naming convention would be followed where the creation date/time is embedded in the name.

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• Java or php tree structure problem

  - by agazerboy

  Hi All, I have all my data in my database. It has following 4 columns id source_clust target_clust result_clust 1 7 72 649 2 9 572 650 3 649 454 651 4 32 650 435 This data is like tree structure. source_clust and target_clust generate target_clust. target_clust can be source_clust or target_clust to make a new target_clust. Is there any php function or class that I can use to generate tree structure for my data???? I see this MySql site they are doing exactly what I need but I couldn't find how to implement that query in my data. Thanks ! Edited Is there any way in java to do it? if we have same data in array ??

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• Better type safety in Java collections

  - by Paul Tomblin

  In my java coding, I often end up with several Map<String,Map<String,foo>> or Map<String,List<String>> and then I have trouble remembering which String is which key. I comment the declaration with //Map<capabiltyId,Map<groupId,foo>> or //Map<groupId,List<capabilityId>, but it's not the greatest solution. If String wasn't final, I would make new classes CapabilityId extends String and GroupId extends String, but I can't. Is there a better way to keep track of which thing is the key and maybe have the compiler enforce it?

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• Bind a java class as a closure into a groovy-script

  - by chrsk

  Is it possible to bind a closure written in java into a groovy-script. Is there an interface or something to implement so i can provide a closure? Something like this? public class Example implements Closure { public void closure(Object... args) { System.out.println(args[0]); } } Bind this into the groovyscript. Binding binding = new Binding(); binding.put("example", new Example()); groovyScriptEngine.run("foo.groovy", binding) and use it in the foo.groovy like this: example("Hello World")

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• how iterate over class members java (app-engine)

  - by Alexandre H. Tremblay

  Hello, I am using the java version of the google app engine. I would like to create a function that can receive as parameters many types of objects. I would like to print out the members of the object. Each objects may be different and the function must work for all objects. Do I have to use reflection - if so, what kind of code do I need to write? public class dataOrganization { private String name; private String contact; private PostalAddress address; public dataOrganization(){} } public int getObject(Object obj){ // This function prints out the name of every // member of the object, the type and the value // In this example, it would print out "name - String - null", // "contact - String - null" and "address - PostalAddress - null" } How would I write the function getObject?

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• What is this technique called in Java?

  - by ShaChris23

  I'm a C++ programmer, and I was reading this site when I came across the example below. What is this technique called in Java? How is it useful? class Application { ... public void run() { View v = createView(); v.display(); ... protected View createView() { return new View(); } ... } class ApplicationTest extends TestCase { MockView mockView = new MockView(); public void testApplication { Application a = new Application() { <--- protected View createView() { <--- return mockView; <--- whao, what is this? } <--- }; <--- a.run(); mockView.validate(); } private class MockView extends View { boolean isDisplayed = false; public void display() { isDisplayed = true; } public void validate() { assertTrue(isDisplayed); } } }

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• Out of Memory When Loading Java Entities

  - by Hugh Buchanan

  I have a terrible problem that hopefully has a very simple answer. I am running out of memory when I perform a basic If I have code like this: MyEntity myEntity; for (Object id: someIdList) { myEntity = find(id); // do something basic with myEntity } And the find() method is a standard EntityManager related method: public MyEntity find(Object id) { return em.find(mycorp.ejb.entity.MyEntity.class, id); } This code worked a couple of weeks ago, and works fine if there are fewer items in the database. The resulting error I am facing is: java.lang.OutOfMemoryError: GC overhead limit exceeded The exception is coming from oracle toplink calling some oracle jdbc methods. The loop exists because an EJBQL such as "select object(o) from MyEntity as o" will overload the application server when there are lots of records.

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• Java Array Comparison

  - by BlairHippo

  Working within Java, let's say I have two objects that, thanks to obj.getClass().isArray(), I know are both arrays. Let's further say that I want to compare those two arrays to each other -- possibly by using Arrays.equals. Is there a graceful way to do this without resorting to a big exhaustive if/else tree to figure out which flavor of Arrays.equals needs to be used? I'm looking for something that's less of an eyesore than this: if (obj1 instanceof byte[] && obj2 instanceof byte[]) { return Arrays.equals((byte[])obj1, (byte[])obj2); } else if (obj1 instanceof boolean[] && obj2 instanceof boolean[]) { ...

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• Which is the best alternative for Java Serialization?

  - by Alotor

  I'm currently working on a project which needs to persist any kind of objects (of which implementation we don't have any control) so these objects could be recovered afterwards. We can't implement a ORM because we can't restrict the users of our library at development time. Our first alternative was to serialize it with the Java default serialization but we had a lot of trouble recovering the objects when the users started to pass different versions of the same object (attributes changed types, names, ...). We have tried with the XMLEncoder class (transforms an object into a XML), but we have found that there is a lack of functionality (doesn't support Enums for example). Finally, we also tried JAXB but this impose our users to annotate their classes. Any good alternative?

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• Java Date Hibernate cut off time

  - by Vlad

  Hi folks, I have a Date type column in Oracle DB and it contains date and time for sure. But when I'm trying to get data in java application it will return date with bunch of zeros instead of real time. In code it'll be like: SQLQuery sqlQuery = session.createSQLQuery("SELECT table.id, table.date FROM table"); List<Object[]> resultArray = sqlQuery.list(); Date date = (Date)resultArray[1]; If it was 26-feb-2010 17:59:16 in DB I'll get 26-feb-2010 00:00:00 How to get it with time?

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• Any Java library for address extraction from emails?

  - by Hans Klock

  I'm looking for an Java open-source library which is able to extract address information from a (German) email (signature). The library should find name street city, city code/postal code email tel/fax address-parser.com is an commercial product, but a free (albeit simple) library would be great. stackoverflow.com/questions/16413/parse-usable-street-address-city-state-zip-from-a-string is asking for something similar, but my problem is broader because the address information is hidden in a complete email. And there isn't a solution either... Any ideas?

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• Java NIO SocketChannel writing problem

  - by Nilesh

  I am using Java NIO's SocketChannel to write : int n = socketChannel.write(byteBuffer); Most of the times the data is sent in one or two parts; i.e. if the data could not be sent in one attemmpt, remaining data is retried. The issue here is, sometimes, the data is not being sent completely in one attempt, rest of the data when tried to send multiple times, it occurs that even after trying several times, not a single character is being written to channel, finally after some time the remaning data is sent. What could be the cause of such behaviour? Could external factors such as RAM, etc cause the hindarance? Please help me solve this issue. If any other information is required please let me know. Thanks

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• Properties framework in java apps

  - by Roman

  Hi All I have been using spring for a while as my IOC. It has also a very nice way of injecting properties in your beans. Now I am participating in a new project where the IOC is Guice. I dont understand fully the concept how should I inject properties in to my beans using Guice. The question : Is it actually possible to inject raw properties ( strings , ints ) into my guice beans. If the answer is no , than maybe you know some nice Properties Framework for java. Because right now I wanted to use the ResourceBundle class for simple properties management in my app. But after using spring for a while this just dont seem seriously enought for me.

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• Javascript library to reliably delay-load java applets

  - by paleozogt

  I'd like to delay-load a Java Applet in the same way that SwfObject loads Flash SWFs-- you supply it a div id and it replaces the div's contents. This would allow the whole page to load before the Applet starts. However, I'd also like to use a best-practices Javascript library like deployJava.js or applet-fu. The problem with these libraries is that they only use document.writeln-- if you use them after the DOM loads they will clobber the page. Are there any Applet-loading JavaScript libraries that allow for delay-loading?

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• How to create a Java String from the contents of a file

  - by Oscar Reyes

  I've been using this idiom for some time now. And it seems to be the most wide spread at least in the sites I've visited. Does anyone have a better/different way to read a file into a string in Java. Thanks private String readFile( String file ) throws IOException { BufferedReader reader = new BufferedReader( new FileReader (file)); String line = null; StringBuilder stringBuilder = new StringBuilder(); String ls = System.getProperty("line.separator"); while( ( line = reader.readLine() ) != null ) { stringBuilder.append( line ); stringBuilder.append( ls ); } return stringBuilder.toString(); }

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• Persistence provider for Java that supports final fields

  - by naeron84

  I'm very new to Java but I've been developing a habit to use final wherever possible declaring immutability which i think is a good thing. (Consider f#) I've read that JPA does not support final fields. Hibernate, TopLink? I'm not sure about these but i prefer JPA for now. Is that even possible theoretically - let's say through reflection - to modify final fields after creation? My guess would be... NO :) What would be certainly possible for a persistence solution is to support constructors with parameters. At least i see no reason that would make this impossible. Mapping would be a little tricky i guess. This is an alternative solution. Suggestions?

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• Java == operator. "Invalid assignment operator"

  - by Tom

  Hi, I was trying to write a simple method boolean validate(MyObject o) { return o.getPropertyA() == null && o.getPropertyB()==null; } And got a strange error on the == null part. Maybe my Java is rusty after a season in PLSQL. Consider this: Integer i = 4; i ==null; //compile error: Syntax error on token ==. Invalid assignment operator. Integer i2 = 4; if (i==null); //No problem How can this be ? Any explanation ? Im using jdk160_05.

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